package com.lognet.wiki.plugin.link;

import java.util.Map;

import com.ecyrd.jspwiki.plugin.*;
import com.ecyrd.jspwiki.*;
import com.ecyrd.jspwiki.attachment.AttachmentManager;
import com.ecyrd.jspwiki.attachment.Attachment;
import com.ecyrd.jspwiki.providers.ProviderException;

/**
*
*
*  @author Lou Masters
*    based on code from Arnaud Lacour
*/

public class Link
implements WikiPlugin
{
	public static final String PARAM_SRC      = "src";
	public static final String PARAM_LABEL      = "label";
	public static final String PARAM_TARGET      = "target";


/**
*  This method is used to clean away things like quotation marks which
*  a malicious user could use to stop processing and insert javascript.
*/
	private static final String getCleanParameter( Map params, String paramId ) {
		return TextUtil.replaceEntities( (String) params.get( paramId ) );
	}

	public String execute( WikiContext context, Map params )
	throws PluginException {
		WikiEngine engine = context.getEngine();
		String src     = getCleanParameter( params, PARAM_SRC );
		String label     = getCleanParameter( params, PARAM_LABEL );
		String target     = getCleanParameter( params, PARAM_TARGET );

		if( src == null ) {
			throw new PluginException("Parameter 'src' is required for Link plugin");
		}
		if ( target == null ) {
			target = "_self";
		}
		if ( label == null ) {
			label = "";
		}

		try {
			AttachmentManager mgr = engine.getAttachmentManager();
			Attachment        att = mgr.getAttachmentInfo( context, src );
			if(att==null) {
				System.out.println("Attachment null with Src= " + src);
			}
			
			if( att != null ) {
				src = context.getURL( WikiContext.ATTACH, att.getName() );
			}
		} catch( ProviderException e ) {
			throw new PluginException( "Attachment info failed: "+e.getMessage() );
		} catch(Exception ee) {
			ee.printStackTrace();
			throw new PluginException( "General error getting attachment: "+ee.getMessage() );
		}

		StringBuffer result = new StringBuffer();

		result.append("<a href=\"" + src + "\" target=\"" + target +"\">");
		result.append(label);
		result.append("</a>");
		return result.toString();
	}
}